Updating objects inside a list using Tables

[Eric Ettes]

Hello all,

I'm struggling with something that's probably really easy, so hopefully someone here can point me in

the right direction :-) 

I'm attempting to create a table for a list of objects using a foreach loop. No problems here, but within this table, the

user should be able to change the 'amount' value per 'ShoppingCartItem'. After submitting, I would like to get the original list

with the updated amount fields per object. In the snippets below I've copy pasted the relevant code that I've built:

Flow right now:

1. User enters a page containing a table with OrderItems

2. User changes the amount values of a few object(s)

3. User presses 'next'

4. Command object 'catches' the new List, validates and maps it back to the ShoppingCart

==============================================

The ShoppingCart object:

class ShoppingCart implements Serializable {

    List<ShoppingCartItem> shoppingCartItems = []

}

==============================================

The ShoppingCartItem object:

class ShoppingCartItem implements Serializable {

    int amount

    int productId

}

==============================================

The part of the .GSP containing the table:

<g:each in="${instance?.shoppingCartItems}" status="i" var="shoppingCartItem">

<tr class="${(i % 2) == 0 ? 'odd' : 'even'}">

        <td>

        <g:textField name="shoppingCartItems[${i}].amount" value="${shoppingCartItem?.amount}" />

        </td>

        <td>

        ${fieldValue(bean: shoppingCartItem, field: "productTitle")}

    </td>

</tr>

</g:each>

==============================================

The part of the Controller where the Command Object should be initialized:

on('next') { AddOrderItemAmountsToReservationCommand command ->

    if (command.hasErrors()) {

        flow.command = command

        return error()

    }

    bindData(flow.instance, command)

    [instance: flow.instance]

}.to 'orderSummary'

==============================================

The Command Object:

class AddOrderItemAmountsToReservationCommand implements Serializable {

    List shoppingCartItems

}

The above code doesn't work, but I managed to get it working to a level where I got a list of amounts

containing the correct values in the params map. Also, the list inside the Command object isn't initialized but

I don't think that should be a problem because I'm basically trying to set the value to an already existing List...

Somehow I believe there's something wrong with the name of the textfield. I'm still struggling on how I 

should tell Grails to reconstruct the original list with updated amounts for each object inside the list :-)

Kind regards,

-- 
Eric Ettes

[Gaurav Chauhan-2]

<g:textField name="shoppingCartItems[${i}].amount" value="${shoppingCartItem?.amount}" />

Where is 'shoppingCartItems' coming from ? Don't you think you should be using 'shoppingCartItem' object here ?

I don't see any object named as  'shoppingCartItems'  in your code ?

Regards
Gaurav Chauhan

On Wed, Nov 9, 2011 at 9:53 PM, Eric Ettes <[hidden email]> wrote:

Hello all,

I'm struggling with something that's probably really easy, so hopefully someone here can point me in

the right direction :-) 

I'm attempting to create a table for a list of objects using a foreach loop. No problems here, but within this table, the

user should be able to change the 'amount' value per 'ShoppingCartItem'. After submitting, I would like to get the original list

with the updated amount fields per object. In the snippets below I've copy pasted the relevant code that I've built:

Flow right now:

1. User enters a page containing a table with OrderItems

2. User changes the amount values of a few object(s)

3. User presses 'next'

4. Command object 'catches' the new List, validates and maps it back to the ShoppingCart

==============================================

The ShoppingCart object:

class ShoppingCart implements Serializable {

    List<ShoppingCartItem> shoppingCartItems = []

}

==============================================

The ShoppingCartItem object:

class ShoppingCartItem implements Serializable {

    int amount

    int productId

}

==============================================

The part of the .GSP containing the table:

<g:each in="${instance?.shoppingCartItems}" status="i" var="shoppingCartItem">

<tr class="${(i % 2) == 0 ? 'odd' : 'even'}">

        <td>

        <g:textField name="shoppingCartItems[${i}].amount" value="${shoppingCartItem?.amount}" />

        </td>

        <td>

        ${fieldValue(bean: shoppingCartItem, field: "productTitle")}

    </td>

</tr>

</g:each>

==============================================

The part of the Controller where the Command Object should be initialized:

on('next') { AddOrderItemAmountsToReservationCommand command ->

    if (command.hasErrors()) {

        flow.command = command

        return error()

    }

    bindData(flow.instance, command)

    [instance: flow.instance]

}.to 'orderSummary'

==============================================

The Command Object:

class AddOrderItemAmountsToReservationCommand implements Serializable {

    List shoppingCartItems

}

The above code doesn't work, but I managed to get it working to a level where I got a list of amounts

containing the correct values in the params map. Also, the list inside the Command object isn't initialized but

I don't think that should be a problem because I'm basically trying to set the value to an already existing List...

Somehow I believe there's something wrong with the name of the textfield. I'm still struggling on how I 

should tell Grails to reconstruct the original list with updated amounts for each object inside the list :-)

Kind regards,

-- 
Eric Ettes

[Eric Ettes]

Hi Gaurav,

Thanks for your reply :-)

'ShoppingCartItems' is the List<ShoppingCartItem> inside the ShoppingCart class (and the AddOrderItemAmountsToReservationCommand). In the code snippets I was trying to see wether Grails would understand that I wanted to map property 'amount' of ShoppingCartItems[i]

I also tried to use name="shoppingCartItem.amount" and  name="shoppingCartItem[${i}].amount", but even though the properties are correctly inside the params, the propertyresolver won't map them back to the ShoppingCartItem objects in the list...

Kind regards,

Eric

-- 
Eric Ettes
Sent with Sparrow

On Wednesday, November 9, 2011 at 5:53 PM, Gaurav Chauhan wrote:

<g:textField name="shoppingCartItems[${i}].amount" value="${shoppingCartItem?.amount}" />

Where is 'shoppingCartItems' coming from ? Don't you think you should be using 'shoppingCartItem' object here ?

I don't see any object named as  'shoppingCartItems'  in your code ?

Regards
Gaurav Chauhan

On Wed, Nov 9, 2011 at 9:53 PM, Eric Ettes <[hidden email]> wrote:

Hello all,

I'm struggling with something that's probably really easy, so hopefully someone here can point me in

the right direction :-) 

I'm attempting to create a table for a list of objects using a foreach loop. No problems here, but within this table, the

user should be able to change the 'amount' value per 'ShoppingCartItem'. After submitting, I would like to get the original list

with the updated amount fields per object. In the snippets below I've copy pasted the relevant code that I've built:

Flow right now:

1. User enters a page containing a table with OrderItems

2. User changes the amount values of a few object(s)

3. User presses 'next'

4. Command object 'catches' the new List, validates and maps it back to the ShoppingCart

==============================================

The ShoppingCart object:

class ShoppingCart implements Serializable {

    List<ShoppingCartItem> shoppingCartItems = []

}

==============================================

The ShoppingCartItem object:

class ShoppingCartItem implements Serializable {

    int amount

    int productId

}

==============================================

The part of the .GSP containing the table:

<g:each in="${instance?.shoppingCartItems}" status="i" var="shoppingCartItem">

<tr class="${(i % 2) == 0 ? 'odd' : 'even'}">

        <td>

        <g:textField name="shoppingCartItems[${i}].amount" value="${shoppingCartItem?.amount}" />

        </td>

        <td>

        ${fieldValue(bean: shoppingCartItem, field: "productTitle")}

    </td>

</tr>

</g:each>

==============================================

The part of the Controller where the Command Object should be initialized:

on('next') { AddOrderItemAmountsToReservationCommand command ->

    if (command.hasErrors()) {

        flow.command = command

        return error()

    }

    bindData(flow.instance, command)

    [instance: flow.instance]

}.to 'orderSummary'

==============================================

The Command Object:

class AddOrderItemAmountsToReservationCommand implements Serializable {

    List shoppingCartItems

}

The above code doesn't work, but I managed to get it working to a level where I got a list of amounts

containing the correct values in the params map. Also, the list inside the Command object isn't initialized but

I don't think that should be a problem because I'm basically trying to set the value to an already existing List...

Somehow I believe there's something wrong with the name of the textfield. I'm still struggling on how I 

should tell Grails to reconstruct the original list with updated amounts for each object inside the list :-)

Kind regards,

-- 
Eric Ettes

[Gaurav Chauhan-2]

Did you try this ?

<g:textField name="${shoppingCartItem?.amount}" value="${shoppingCartItem?.amount}" />

Regards
Gaurav Chauhan

On Wed, Nov 9, 2011 at 10:31 PM, Eric Ettes <[hidden email]> wrote:

Hi Gaurav,

Thanks for your reply :-)

'ShoppingCartItems' is the List<ShoppingCartItem> inside the ShoppingCart class (and the AddOrderItemAmountsToReservationCommand). In the code snippets I was trying to see wether Grails would understand that I wanted to map property 'amount' of ShoppingCartItems[i]

I also tried to use name="shoppingCartItem.amount" and  name="shoppingCartItem[${i}].amount", but even though the properties are correctly inside the params, the propertyresolver won't map them back to the ShoppingCartItem objects in the list...

Kind regards,

Eric

-- 
Eric Ettes
Sent with Sparrow

On Wednesday, November 9, 2011 at 5:53 PM, Gaurav Chauhan wrote:

<g:textField name="shoppingCartItems[${i}].amount" value="${shoppingCartItem?.amount}" />

Where is 'shoppingCartItems' coming from ? Don't you think you should be using 'shoppingCartItem' object here ?

I don't see any object named as  'shoppingCartItems'  in your code ?

Regards
Gaurav Chauhan

On Wed, Nov 9, 2011 at 9:53 PM, Eric Ettes <[hidden email]> wrote:

Hello all,

I'm struggling with something that's probably really easy, so hopefully someone here can point me in

the right direction :-) 

I'm attempting to create a table for a list of objects using a foreach loop. No problems here, but within this table, the

user should be able to change the 'amount' value per 'ShoppingCartItem'. After submitting, I would like to get the original list

with the updated amount fields per object. In the snippets below I've copy pasted the relevant code that I've built:

Flow right now:

1. User enters a page containing a table with OrderItems

2. User changes the amount values of a few object(s)

3. User presses 'next'

4. Command object 'catches' the new List, validates and maps it back to the ShoppingCart

==============================================

The ShoppingCart object:

class ShoppingCart implements Serializable {

    List<ShoppingCartItem> shoppingCartItems = []

}

==============================================

The ShoppingCartItem object:

class ShoppingCartItem implements Serializable {

    int amount

    int productId

}

==============================================

The part of the .GSP containing the table:

<g:each in="${instance?.shoppingCartItems}" status="i" var="shoppingCartItem">

<tr class="${(i % 2) == 0 ? 'odd' : 'even'}">

        <td>

        <g:textField name="shoppingCartItems[${i}].amount" value="${shoppingCartItem?.amount}" />

        </td>

        <td>

        ${fieldValue(bean: shoppingCartItem, field: "productTitle")}

    </td>

</tr>

</g:each>

==============================================

The part of the Controller where the Command Object should be initialized:

on('next') { AddOrderItemAmountsToReservationCommand command ->

    if (command.hasErrors()) {

        flow.command = command

        return error()

    }

    bindData(flow.instance, command)

    [instance: flow.instance]

}.to 'orderSummary'

==============================================

The Command Object:

class AddOrderItemAmountsToReservationCommand implements Serializable {

    List shoppingCartItems

}

The above code doesn't work, but I managed to get it working to a level where I got a list of amounts

containing the correct values in the params map. Also, the list inside the Command object isn't initialized but

I don't think that should be a problem because I'm basically trying to set the value to an already existing List...

Somehow I believe there's something wrong with the name of the textfield. I'm still struggling on how I 

should tell Grails to reconstruct the original list with updated amounts for each object inside the list :-)

Kind regards,

-- 
Eric Ettes

[Eric Ettes]

Hi Gaurav,

Thanks for the reply :-)

Just gave it a go, but because the object isn't initialized yet (It's an empty basket at that time), it doesn't have a value and thus I'm getting an exception 'Tag [textField] is missing required attribute [name] or [field]'

Whenever I use shoppingCartItems.shoppingCartItem[${i}].amount as a name, I can inspect the parameter map and retrieve the values like this:

params.'shoppingCartItems.shoppingCartItem[0].amount'

params.'shoppingCartItems.shoppingCartItem[1].amount'

etc...

Same for shoppingCartItem[${i}].amount, only then I can use params.'shoppingCartItem[1].amount'

Kind regards,

Eric

-- 
Eric Ettes
Sent with Sparrow

On Wednesday, November 9, 2011 at 6:03 PM, Gaurav Chauhan wrote:

Did you try this ?

<g:textField name="${shoppingCartItem?.amount}" value="${shoppingCartItem?.amount}" />

Regards
Gaurav Chauhan

On Wed, Nov 9, 2011 at 10:31 PM, Eric Ettes <[hidden email]> wrote:

Hi Gaurav,

Thanks for your reply :-)

'ShoppingCartItems' is the List<ShoppingCartItem> inside the ShoppingCart class (and the AddOrderItemAmountsToReservationCommand). In the code snippets I was trying to see wether Grails would understand that I wanted to map property 'amount' of ShoppingCartItems[i]

I also tried to use name="shoppingCartItem.amount" and  name="shoppingCartItem[${i}].amount", but even though the properties are correctly inside the params, the propertyresolver won't map them back to the ShoppingCartItem objects in the list...

Kind regards,

Eric

-- 
Eric Ettes
Sent with Sparrow

On Wednesday, November 9, 2011 at 5:53 PM, Gaurav Chauhan wrote:

<g:textField name="shoppingCartItems[${i}].amount" value="${shoppingCartItem?.amount}" />

Where is 'shoppingCartItems' coming from ? Don't you think you should be using 'shoppingCartItem' object here ?

I don't see any object named as  'shoppingCartItems'  in your code ?

Regards
Gaurav Chauhan

On Wed, Nov 9, 2011 at 9:53 PM, Eric Ettes <[hidden email]> wrote:

Hello all,

I'm struggling with something that's probably really easy, so hopefully someone here can point me in

the right direction :-) 

I'm attempting to create a table for a list of objects using a foreach loop. No problems here, but within this table, the

user should be able to change the 'amount' value per 'ShoppingCartItem'. After submitting, I would like to get the original list

with the updated amount fields per object. In the snippets below I've copy pasted the relevant code that I've built:

Flow right now:

1. User enters a page containing a table with OrderItems

2. User changes the amount values of a few object(s)

3. User presses 'next'

4. Command object 'catches' the new List, validates and maps it back to the ShoppingCart

==============================================

The ShoppingCart object:

class ShoppingCart implements Serializable {

    List<ShoppingCartItem> shoppingCartItems = []

}

==============================================

The ShoppingCartItem object:

class ShoppingCartItem implements Serializable {

    int amount

    int productId

}

==============================================

The part of the .GSP containing the table:

<g:each in="${instance?.shoppingCartItems}" status="i" var="shoppingCartItem">

<tr class="${(i % 2) == 0 ? 'odd' : 'even'}">

        <td>

        <g:textField name="shoppingCartItems[${i}].amount" value="${shoppingCartItem?.amount}" />

        </td>

        <td>

        ${fieldValue(bean: shoppingCartItem, field: "productTitle")}

    </td>

</tr>

</g:each>

==============================================

The part of the Controller where the Command Object should be initialized:

on('next') { AddOrderItemAmountsToReservationCommand command ->

    if (command.hasErrors()) {

        flow.command = command

        return error()

    }

    bindData(flow.instance, command)

    [instance: flow.instance]

}.to 'orderSummary'

==============================================

The Command Object:

class AddOrderItemAmountsToReservationCommand implements Serializable {

    List shoppingCartItems

}

The above code doesn't work, but I managed to get it working to a level where I got a list of amounts

containing the correct values in the params map. Also, the list inside the Command object isn't initialized but

I don't think that should be a problem because I'm basically trying to set the value to an already existing List...

Somehow I believe there's something wrong with the name of the textfield. I'm still struggling on how I 

should tell Grails to reconstruct the original list with updated amounts for each object inside the list :-)

Kind regards,

-- 
Eric Ettes